Which department oversees vehicle registration in Guam?

The Guam Department of Revenue and Taxation is the correct department that oversees vehicle registration in Guam. This authority manages various taxation-related functions, including the registration of vehicles, collection of taxes, and issuance of licenses, ensuring compliance with local laws. This centralized approach helps streamline the administrative process for vehicle registration, making it easier for residents to comply with legal requirements related to vehicle ownership and operation.

Other options, such as the Department of Transportation and the Department of Motor Vehicles, may be involved in related transportation issues or services but do not have the primary role in vehicle registration. Meanwhile, the Guam Police Department focuses on law enforcement and public safety, lacking any direct responsibility for vehicle registration processes. Thus, the role of the Guam Department of Revenue and Taxation is specifically designated for this function, making it the right answer.